Parts for your 2010 Nissan Serena-Temperature sensors

2010 Nissan Serena temperature sensors

Based on Nissan’s factory service information for the C25/C26 Serena (EC and HA sections) and Jatco RE0F10A CVT data, temperature sensors are definitely used on the 2010 Nissan Serena. The documents specify an Engine Coolant Temperature (ECT) sensor for the MR20DE, an Intake Air Temperature (IAT) element within the MAF, air‑con ambient and evaporator temperature sensors, plus a CVT fluid temperature sensor. Nissan CONSULT‑III diagnostic procedures for this model also list ECT‑related DTCs P0115–P0119, confirming their presence and role.

On this Serena, temperature sensors help the engine, transmission and HVAC behave themselves across Aussie and Kiwi conditions. The ECT tells the ECU how hot the engine is so it can fine‑tune fuel, ignition and idle. The IAT helps with air‑fuel trims, particularly on cold starts. The CVT fluid temperature sensor protects the transmission by adjusting pressure and ratios as fluid warms up. Ambient and evaporator sensors let the climate control keep the cabin comfy without fogging the screen or icing the evaporator.

There’s no fixed replacement interval, but they’re worth checking during regular servicing. Under the bonnet, an ECT that reads cold all the time can cause rich running, rough idle and high fuel use, reading hot can trigger fans early and throw a MIL. Typical operating coolant temp is around the low‑to‑mid 90s °C once warm. A scan tool reading that matches reality (use an infrared thermometer at the thermostat housing) is the quick health check.

If replacement’s needed, use quality OEM‑spec parts. On the ECT: allow the engine to cool, bleed coolant after refit, and avoid over‑tightening into the alloy housing. Address any green crust or oil contamination on connectors—dodgy terminals often mimic a failed sensor. For the IAT (in the MAF), make sure the air filter and intake are clean, never soak a hot‑wire MAF in harsh cleaners. CVT temperature faults should be confirmed with live data, if temps look fine but codes persist, inspect the internal harness and grounds before condemning the sensor. Climate sensors usually fail by skewing cabin temps, verify with the HVAC self‑diagnostic and replace the affected sensor rather than guessing.

• Common signs: tough cold starts, hunting idle, poor fuel economy, fans running constantly, HVAC that won’t hold set temperature, or CVT going into limp mode on long climbs.
• Good practices: fresh coolant at the correct spec, clean electrical grounds, intact air ducting, and periodic scan checks of live temperature PIDs.

All up, keeping the Serena’s temperature sensors honest helps fuel economy, drivability, gearbox longevity and cabin comfort.

Popular questions about 2010 Nissan Serena temperature sensors

Does the 2010 Serena actually have multiple temperature sensors, and where are they?
The model uses several: the ECT on the engine (coolant passage near the thermostat), an IAT element integrated in the MAF housing, a CVT fluid temperature sensor inside the transmission, and climate sensors including ambient (front bumper area) and evaporator (inside the HVAC case). These are documented in Nissan’s EC, AT/CVT and HA service sections and are visible in CONSULT‑III live data.

What symptoms point to a failing ECT on a 2010 Serena?
Expect hard cold starts, rich running, high fuel use, a cooling fan that kicks in early or stays on, and a MIL with codes like P0115–P0119. Compare scan tool coolant temperature to an external reading, if they’re miles apart, the sensor, its connector, or wiring may be at fault.

Is it safe to keep driving with a dodgy temperature sensor?
Short answer: best not. While the car may run, incorrect readings can wash fuel into the cylinders, overwork the fans, or push the CVT into protective behaviour. Sorting it early prevents bigger repair bills and keeps the Serena running sweet.